Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance
The basicity and acidity of solvent-treated layered double hydroxide (ST-LDHs) and their layered double oxides (ST-LDOs) have been fully studied using Hammett titration, in situ FTIR, CO2-TPD and NH3-TPD. Five solvents (ethanol, acetone, isopropanol, ethyl acetate and 1-hexanol) were selected to tre...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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Royal Society of Chemistry
2020
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| _version_ | 1826285390584086528 |
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| author | Leung, DWJ Chen, C Buffet, J-C O'Hare, D |
| author_facet | Leung, DWJ Chen, C Buffet, J-C O'Hare, D |
| author_sort | Leung, DWJ |
| collection | OXFORD |
| description | The basicity and acidity of solvent-treated layered double hydroxide (ST-LDHs) and their layered double oxides (ST-LDOs) have been fully studied using Hammett titration, in situ FTIR, CO2-TPD and NH3-TPD. Five solvents (ethanol, acetone, isopropanol, ethyl acetate and 1-hexanol) were selected to treat [Mg0.72Al0.28(OH)2](CO3)0.14 (Mg2.5Al-CO3 LDH) and compared with traditional LDH co-precipitated from water. The Brønsted basicity strength of the ST-LDHs and ST-LDOs increased but was accompanied by a decrease in basic site density. In addition, the Lewis acidity of ST-LDOs also changes significantly, with medium strength Lewis acid sites dissapearing after solvent treatment. We found that the CO2 capture capacity of solvent treated LDOs is 50% higher than that of traditional co-precipitated LDO sample. The ethanol treated LDO exhibited the highest CO2 uptake of 1.01 mmol g−1. The observed CO2 capture performance of the ST-LDOs correlates linearly with the ratio of total acid sites to total basic sites. |
| first_indexed | 2024-03-07T01:28:06Z |
| format | Journal article |
| id | oxford-uuid:92a885f2-b426-41d2-89df-c8a90c34ec4b |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:28:06Z |
| publishDate | 2020 |
| publisher | Royal Society of Chemistry |
| record_format | dspace |
| spelling | oxford-uuid:92a885f2-b426-41d2-89df-c8a90c34ec4b2022-03-26T23:27:05ZCorrelations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performanceJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:92a885f2-b426-41d2-89df-c8a90c34ec4bEnglishSymplectic ElementsRoyal Society of Chemistry2020Leung, DWJChen, CBuffet, J-CO'Hare, DThe basicity and acidity of solvent-treated layered double hydroxide (ST-LDHs) and their layered double oxides (ST-LDOs) have been fully studied using Hammett titration, in situ FTIR, CO2-TPD and NH3-TPD. Five solvents (ethanol, acetone, isopropanol, ethyl acetate and 1-hexanol) were selected to treat [Mg0.72Al0.28(OH)2](CO3)0.14 (Mg2.5Al-CO3 LDH) and compared with traditional LDH co-precipitated from water. The Brønsted basicity strength of the ST-LDHs and ST-LDOs increased but was accompanied by a decrease in basic site density. In addition, the Lewis acidity of ST-LDOs also changes significantly, with medium strength Lewis acid sites dissapearing after solvent treatment. We found that the CO2 capture capacity of solvent treated LDOs is 50% higher than that of traditional co-precipitated LDO sample. The ethanol treated LDO exhibited the highest CO2 uptake of 1.01 mmol g−1. The observed CO2 capture performance of the ST-LDOs correlates linearly with the ratio of total acid sites to total basic sites. |
| spellingShingle | Leung, DWJ Chen, C Buffet, J-C O'Hare, D Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance |
| title | Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance |
| title_full | Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance |
| title_fullStr | Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance |
| title_full_unstemmed | Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance |
| title_short | Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance |
| title_sort | correlations of acidity basicity of solvent treated layered double hydroxides oxides and their co2 capture performance |
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